JPH0221862Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a ground pressure adjustment device for rice transplanters, and compared to the conventional float angle detection method, it
The purpose is to provide a rice transplanter equipped with a ground pressure adjustment device that is not affected by speed. To achieve this purpose, we adopted the following configuration.

In other words, the center float is set to be movable up and down relative to the left and right floats, but this is always biased toward the ground side by a grounding spring, the level difference between the center float and the left and right floats is detected by a detector, and the float is raised or lowered by this signal. Activate the mechanism to raise and lower the planting section,
This allows the ground pressure of the float to be adjusted.

Generally, if the height of the seedling planting device relative to the field changes, the seedlings will not be planted in a substantially constant state. By raising and lowering the lifting mechanism for raising and lowering the seedling device with respect to the wheels according to the height with the seedling planting device, the height of the float and the seedling planting device, and by extension the seedling device with respect to the field scene. automatic control of the height to a substantially constant value is being carried out.

This project improves on this and creates a lifting device for the planting area that is unaffected by water depth and speed.

The embodiments shown in the drawings will be described below.

In FIG. 1, reference numeral 1 denotes a running vehicle body, and there are a front wheel 3 and a rear wheel 5 at the front and rear of a body frame 2 of the running vehicle body, and the rear wheel 5 is attached via a chain case 4.

A control seat 6 and a handle 7 are provided on the upper surface of the vehicle body frame 2, and each wheel 3, 5 is driven by an engine 8 on the front upper surface of the vehicle body frame 2 to drive the vehicle.
Reference numeral 9 denotes a parallel link mechanism 10 at the rear of the traveling vehicle body 1.
The seedling planting device 9 is attached to a transmission case 11 so as to be vertically movable through the transmission case 1.
Planting cases 13, 13, 13 attached to the left and right sides of 1 at appropriate intervals in the lateral direction via support members 12, 12,
Float 14, 1 arranged on the bottom of each planting case
5, 14 and a seedling platform 16 whose upper end is inclined so as to approach the traveling vehicle body 1, and a vertically swinging type seedling planting mechanism 17 is provided at the rear end of each planting case. A single-acting hydraulic cylinder 18 is provided between the seedling planting device 1 and the parallel link mechanism 10 for raising and lowering the seedling planting device 9 with respect to the field.

A bracket 19 is provided on the upper surface of the central float 15, an arm 20 is pivotally connected to the pin 21, and a support case 22 is fixed to the planting case 13.
has an axis 23. The support case 22 is composed of a fixed frame 22a with a shaft 23 and a movable plate 22b integrated with the arm 20 below the fixed frame 22a, and the movable plate 22b and the arm 20 are integrated and swing up and down about the shaft 23 .

24 is an outer receiving metal fitting attached to the fixed frame 22a, and the inner wire 26 of the outer wire 25 is inserted between the fixed frame 22a and the movable plate 22b, and one end of the inner wire 26 is pulled out from the movable plate 22b. A stopper 27 is attached to its end. A grounding spring 28 is wound around the inner wire portion pulled out from the movable plate 22b.

Therefore, the grounding spring 28 always urges the float 15 toward the grounding side via the arm 20.

Next, the inner wire 26 described above is connected to a ground pressure adjustment lever 27, and 30 indicates a connecting fitting thereof.

The ground pressure adjustment lever 27 is swingable back and forth about the fulcrum 36 and is movable along the guide groove of the guide plate 29.

Next, the movable plate 22b is also used to turn on and off a double switch 31 that is attached to the fixed frame 22a and consists of a normally open switch 31a and a normally closed switch 31b. ₁ , SOL ₂ is excited.

In the traveling vehicle body 1, there is a solenoid valve 32 in the hydraulic circuit 34 extending from the hydraulic pump 33 to the hydraulic cylinder 35. The seedling planting device 9 is raised to a raised position, and the oil pressure of the hydraulic cylinder 35 is released to raise the seedling planting device 9.
Solenoid SOL ₁ in the 3rd position of the lowering position to lower the
It is designed to be switched by SOL ₂ .
Now, use the ground pressure adjustment lever 27 to pull or loosen the inner wire 26 to release the ground pressure spring 28.
Adjust.

When the planting work is started after the adjustment, the ground pressure of the floats 14, 15, 14 changes depending on the unevenness of the field. When the ground pressure of the outer float 14 on the fixed side increases, the center float 15 is lifted up against the force of the ground spring 28 due to the increased ground pressure, and the movable plate 22b is lowered via the arm 20. Therefore, the switch 31a on the normal oven side is turned ON, and the solenoid SOL ₁ operates to operate the hydraulic cylinder 35 to the upward side, raising the planting part to the reference position by the ground spring, which has been adjusted in advance with the ground pressure adjustment lever. It will be forced. At that time, the switch 31b on the normally closed side
Since it is OFF, solenoid SOL ₂ does not work. Next, when the ground pressure of the outer floats 14, 14 becomes low, the center float 15
is lowered, and the movable plate 22b is raised via the arm 20. Therefore, switch 31b on the normally closed side is turned on, solenoid SOL ₂ is activated,
The hydraulic cylinder 35 is actuated to the lowering side, and the planting portion is lowered to the reference position set by the grounding spring, which has been adjusted in advance with the grounding pressure adjustment lever.

At that time, the normally open side switch 31a
Since it is OFF, solenoid SOL ₁ does not work. In the adjusted neutral position of the grounding spring, neither switch is turned on, and solenoid SOL ₁ ,
SOL ₂ doesn't work at all.

Therefore, planting is carried out under adjusted ground pressure.

The device that raises and lowers the planting area by detecting the angle of the float detects the front up slope and front down slope of the float, so the slope of the float depends on the water depth and speed, so it is necessary to keep the planting constant. However, the proposed method does not detect the angle of the float, but uses the ground pressure, so there is no such problem.

[Brief explanation of the drawing]

FIG. 1 is a side view of the riding rice transplanter, FIG. 2 is a plan view of the same, and FIG. 3 is an explanatory diagram showing the proposed device. 14, 14, 15...Float, 22a...Fixed frame, 22b...Movable plate, 28...Ground pressure spring,
31...Switch, 32...Solenoid valve.

Claims (1)

[Scope of utility model registration request] The center float is set to be movable up and down relative to the left and right floats, but this is always biased toward the ground side by a grounding spring, and a detector detects the level difference between the center float and the left and right floats, and this signal activates the lifting mechanism. A ground pressure adjustment device for a rice transplanter, which is configured to operate to raise and lower a planting part, thereby adjusting the ground pressure of a float.